Much as I would like to see Gatwick in S22 running at full capacity and BA returning with their S19 schedule.... I think this is unlikely. Despite the progress with vaccines, much of the world outside N.America/western Europe remains unvaccinated and it will take a long time to achieve vaccination levels compared to the UK. Furthermore, there is the possibility of a new variant emerging, and I imagine after the volatility over S20 and S21 as to which countries are or are not permitted from the UK, passengers are going to be a little bit cautious about spending money only to find they have to cancel to avoid quarantine
S22 is going to be a rebuild-confidence season.... we are unlikely to see a robust and thiriving Gatwick before S23